Hey 850 R I have a 98 S70GLT doing the same thing it seems. Do you notice it when you pull up hill more than on flat ground and when first accelerating. I have not been able to figure mine out yet. I will keep yall updated

P.S. No Notable Vibration during tapping

Thanks for replying Ozark. I always use Mobil 1 10W30 full synthetic. It does sound like a lifter to me but with the way it only does it only under certain conditions makes me question weather it could be one. I don't think it is the CV because it seems to be related to engine speed and not actual s...

Hey after having saved several thousand dollars in repair and labor and lots of pain and grief by listening to the advise on this website I have finally become a member. I searched all over the site and did not see any links exactly matching this one so here I go. 1 Year ago I bought my 3rd and late...